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2 Pieces of Saft LS-14250 1/2 AA 3.6V Lithium Primary Battery for Mac computers (non Rechargeable) - Apple Apple Apple Apple
2x 1/2AA size Lithium Thionyl Chloride Cylindrical Cell High energy, high reliability 3.6 volt Excellent memory backup power source. Low self discharge rate gives this cell a 10 year shelf life